OSMENG-1155: Implementation of Constants and Dataclasses

Add implementation for workflows and activities

Change-Id: I58226765c41d18821724ac5763a3fe390c371ca6
Signed-off-by: Dario Faccin <dario.faccin@canonical.com>
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
19 files changed